ARVAsonic is an innovative parallel guidance system that use one or more ultrasound sensors. It permits to work on row based cultures such as vineyards or orchards, that are the situations in which the operator needs an economic and an highly precise solution. Exploiting ultrasound it's possible to reach a centimetric precision with significantly lower costs than those of a centimetric GPS technology. It's very important the presence of a first straight row or a reference curve. ARVAsonic is only installed on hydro-steering provided vehicles like tractors, pruning trailers, self propelled machines etc..